Ai Okumura
type: MusicGroup
popularity: 7
followers: 422
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xd124b9ea3e226536fbf93256a010bf20afa6c0016405ccff7fcf0bda7540cf12
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953975
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953975
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2b4dba5d-5081-42ec-9790-890ca9f87d6b.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/2b4dba5d-5081-42ec-9790-890ca9f87d6b.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/2b4dba5d-5081-42ec-9790-890ca9f87d6b
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T16:53:41Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xd124b9ea3e226536fbf93256a010bf20afa6c0016405ccff7fcf0bda7540cf12","name":"Ai Okumura","registered_at":"2026-06-16T04:36:31Z","symbol":"NIM0939414","token_address":"0xe58c8c287cf48821325bc586b1b7d78a0ac0e85a","type":"artist","uuid":"2b4dba5d-5081-42ec-9790-890ca9f87d6b"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd124b9ea3e226536fbf93256a010bf20afa6c0016405ccff7fcf0bda7540cf12. Chain 2 (Bitcoin): anchored in block 953976 (2026-06-16T16:55:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b4dba5d-5081-42ec-9790-890ca9f87d6b.json and https://artists.proofprofile.net/proofs/artist/2b4dba5d-5081-42ec-9790-890ca9f87d6b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-16T16:55:36Z
  text: {"copyright_id":"0xd124b9ea3e226536fbf93256a010bf20afa6c0016405ccff7fcf0bda7540cf12","name":"Ai Okumura","registered_at":"2026-06-16T04:36:31Z","symbol":"NIM0939414","token_address":"0xe58c8c287cf48821325bc586b1b7d78a0ac0e85a","type":"artist","uuid":"2b4dba5d-5081-42ec-9790-890ca9f87d6b"}
album: Maria
  type: MusicAlbum
  date published: 2004-11-10
  track: カノン
    type: MusicRecording
    duration: PT7M11S
    duration ms: 431120
    explicit: false
    by artist: Ai Okumura
    in album: Maria
      type: MusicAlbum
      date published: 2004-11-10
    isrc code: JPB600471904
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-17T07:50:40+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x815247f477566f2d47240b8acb9cc9f6b59d8bae2012f7dfc2a8cf84ad281d9c
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 958388
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/958388
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPB600471904
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-17T10:51:18Z
    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815247f477566f2d47240b8acb9cc9f6b59d8bae2012f7dfc2a8cf84ad281d9c. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T10:51:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPB600471904.
      date published: 2026-07-17T10:51:18Z
    audio: カノン
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 131.535
      additional property: Musical Key
        type: PropertyValue
        value: 2
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.206
      additional property: Energy
        type: PropertyValue
        value: 0.234
      additional property: Speechiness
        type: PropertyValue
        value: 0.037
      additional property: Acousticness
        type: PropertyValue
        value: 0.54
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.384
      additional property: Liveness
        type: PropertyValue
        value: 0.146
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.248
      additional property: Loudness (dB)
        type: PropertyValue
        value: -12.71
      additional property: Key Name
        type: PropertyValue
        value: D
      additional property: Mode Name
        type: PropertyValue
        value: Major
album: 愛の悲しみ
  type: MusicAlbum
  date published: 2005-11-16
album: エンターテイナー
  type: MusicAlbum
  date published: 2005-11-16
album: ポエジー
  type: MusicAlbum
  date published: 2008-03-26
album: ラヴェンダーの咲く庭で
  type: MusicAlbum
  date published: 2010-11-03
album: With a Smile ～微笑みをそえて～
  type: MusicAlbum
  date published: 2013-11-20